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Thread: PWM Electric Fan Control (Again)

  1. #1

    Default PWM Electric Fan Control (Again)

    I know this topic has been beat to death, but I thought I'd contribute some of the work I've done. Danny, if this needs to be merged with one of the other threads, feel free. Some of the info is new though.

    I know there has been success using the Corvette module and variants of it. I'm not trying to reinvent the wheel, but I was looking for another option for a couple of reasons. Mainly because my fans pull more amperage than 1 of those modules should handle reliably (meaning I would need to run two). Also, those controllers aren't cheap and the connectors can be a problem.

    The solution I found, the MCP233: https://www.basicmicro.com/MCP233-Du...ller_p_39.html
    You can read the specs, but this is basically a DC motor controller that accepts a PWM+ input (among other input possibilities) and can handle 60 amps or 2 x 30 amps. Perfect for two fans. It's made for robotics and people who have some level of electronics and robotics experience, which is NOT me, but I was still able to get through it with some help from the guy at Basic Motion, who is extremely knowledgeable & helpful. This module is fully programmable with the free software and has way more capability than what I'm using it for, but I have it up & running and it's flawless.

    So there you have it. A compact, high amperage, readily available, and easy to wire fan controller for $200.
    PS: There are cheaper versions of this same idea available, but they have their disadvantages, IMO. They are usually just circuit boards, not a potted, enclosed module like we'd want for an underhood environment, and they also don't have the same level of tech support. If you're adventurous though, you can probably do what I did for a lot less money.

  2. #2
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    Location
    Connecticut
    Posts
    25,152

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    Quote Originally Posted by racindego View Post
    Danny, if this needs to be merged with one of the other threads, feel free. Some of the info is new though.
    I think it's fine right here. Nice post. I assume they offer a model for brushless DC motors too.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3

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    They have all kinds of stuff; the majority of which goes right over my head!

  4. #4

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    Very interesting, I especially like the "regenerative capabilities". Any fan is only effective at slow road speeds, at highway speed the vehicle moving through the air is actually driving the fan, which could be used to generate power using these modules, easing the load on the alternator. Less load equals better economy!
    Andrew

  5. #5

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    I used the Chrysler one, Dorman 902-310. $40 and works perfectly for two fans. Don't know the total amperage of my two fans, but it's less than 40A total. Comes with the pigtail too.

  6. #6

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    The Dorman part looks like a nice option too. I'd need to run two of those, which would probably eliminate the concern of burning up the connectors.

  7. #7

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    FYI: I opted for the C6 PWM Fan Controller in mine because I already had it along with wiring, but was looking at the Dorman 902-310 as well as an alternative. I sent Dorman an email inquiry back in June to ask about the max amps current they can support. They responded back 16.6A continuously is what's it's been tested for, see below. (Note some personal info removed.)
    For comparison, the C6 PWM is supposed to be rated for 33A and I run dual (but different performance) 12" SPAL fans:
    https://www.holley.com/products/cool...parts/30103202 PRIMARY
    https://www.holley.com/products/cool...parts/30100467 SECONDARY
    With both running at full duty cycle, amp draw as measured with a clamp on DC ammeter runs at just around 16-18 amps. It's odd because the 30103202 fan specs say it should draw 38.6A which I couldn't get it anywhere near that even with the fan face down on flat table it only drew 24A.
    Getting a new FB Shroud soon, and going to up the SECONDARY to the SPAL 30101522 (can't fit another 30103202 due to air intake clearance) and will re-check combined/individual current draws. Anyway, YMMV just sharing my experience. HTH
    ================================================== =====================
    Sent: Thursday, June 13, 2019 7:50 PM
    To: Techline Marketing
    Subject: [External] - Radiator Fan Relay and Pigtail 902-310
    Hello, what is the maximum amps current that can run through this relay?
    https://www.dormanproducts.com/p-47907-902-310.aspx. Thank you!
    ================================================== ======================
    Sent: Friday, June 14, 2019 7:39 AM
    To: Techline Marketing
    Subject: RE: [External] - Radiator Fan Relay and Pigtail 902-310
    Frank, This relay is tested to run at 16.6 amps continuously.
    Regards, Kevin S
    Dorman Products
    Tech Line Specialist

    HP EFI V4, 388cid Stealth Ram, 1000 CFM 58mm throttle body, Holley Dual Sync Distributor. LS Coil Near Plug, 1 bar MAP, 48 lb/hr Holley EFI injectors, 43 psi

  8. #8

    Default

    Interesting, nice they told you the rating. They wouldn't tell me anything when I asked a few years ago. You made me check mine. I looked up my fans and combined they are rated at 28 amps. Back calculating that with the controller rated Watts corresponds to 59% pulse. Looking at past datalogs, my setup never runs the fans over 61-65%, and only for a minute or two at that. So I'm close enough, but maxing it there. I'll change my tables to just leave it at 60% max. Works for me, but may not for others. Thanks for making me double check!

  9. #9

    Default

    Quote Originally Posted by 383_StealthRam View Post
    FYI: I opted for the C6 PWM Fan Controller in mine because I already had it along with wiring, but was looking at the Dorman 902-310 as well as an alternative. I sent Dorman an email inquiry back in June to ask about the max amps current they can support. They responded back 16.6A continuously is what's it's been tested for, see below. (Note some personal info removed.)
    For comparison, the C6 PWM is supposed to be rated for 33A and I run dual (but different performance) 12" SPAL fans:
    https://www.holley.com/products/cool...parts/30103202 PRIMARY
    https://www.holley.com/products/cool...parts/30100467 SECONDARY
    With both running at full duty cycle, amp draw as measured with a clamp on DC ammeter runs at just around 16-18 amps. It's odd because the 30103202 fan specs say it should draw 38.6A which I couldn't get it anywhere near that even with the fan face down on flat table it only drew 24A.
    Getting a new FB Shroud soon, and going to up the SECONDARY to the SPAL 30101522 (can't fit another 30103202 due to air intake clearance) and will re-check combined/individual current draws. Anyway, YMMV just sharing my experience. HTH
    ================================================== =====================
    Sent: Thursday, June 13, 2019 7:50 PM
    To: Techline Marketing
    Subject: [External] - Radiator Fan Relay and Pigtail 902-310
    Hello, what is the maximum amps current that can run through this relay?
    https://www.dormanproducts.com/p-47907-902-310.aspx. Thank you!
    ================================================== ======================
    Sent: Friday, June 14, 2019 7:39 AM
    To: Techline Marketing
    Subject: RE: [External] - Radiator Fan Relay and Pigtail 902-310
    Frank, This relay is tested to run at 16.6 amps continuously.
    Regards, Kevin S
    Dorman Products
    Tech Line Specialist
    Good info. Your research on the Dorman part is exactly what steered me away. I don't want to worry about cooked connectors or components.

    I have a Derale dual fan setup now that has 2 Spal 12" fans that are supposed to be pulling 25 amps each continuously. Like you, I measured and like you, I found they pulled far less. About 15 amps each max with the engine off. So I called Derale and got no help. So then I called Spal with the actual part number on the fan. The tech guy at Spal told me the fans should pull 25 amps continuously. I have no idea what's going on with these ratings, but I do know I don't have to worry about melting parts with the setup I have.

  10. #10
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,152

    Default

    SPAL has their own programmable fan controller, but I'm not sure I like it and the instructions aren't very good: http://www.spal-usa.com/fans/automat...es/fanpwm.html (SPAL FAN-PWM Controller) However, their electric cooling fans are the best in the industry.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

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